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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#NOTE">NOTE</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#CONFORMING-TO">CONFORMING TO</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update, MD4_Final, MD5_Init, MD5_Update, MD5_Final - MD2, MD4, and MD5 hash functions</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> <span class="comment">#include &lt;openssl/md2.h&gt;</span>
 
 <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*MD2</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*d</span><span class="operator">,</span> <span class="variable">unsigned</span> <span class="variable">long</span> <span class="variable">n</span><span class="operator">,</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*md</span><span class="operator">);</span>
 
 <span class="keyword">int</span> <span class="variable">MD2_Init</span><span class="operator">(</span><span class="variable">MD2_CTX</span> <span class="variable">*c</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">MD2_Update</span><span class="operator">(</span><span class="variable">MD2_CTX</span> <span class="variable">*c</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*data</span><span class="operator">,</span> <span class="variable">unsigned</span> <span class="variable">long</span> <span class="variable">len</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">MD2_Final</span><span class="operator">(</span><span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*md</span><span class="operator">,</span> <span class="variable">MD2_CTX</span> <span class="variable">*c</span><span class="operator">);</span>
 
 
 <span class="comment">#include &lt;openssl/md4.h&gt;</span>
 
 <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*MD4</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*d</span><span class="operator">,</span> <span class="variable">unsigned</span> <span class="variable">long</span> <span class="variable">n</span><span class="operator">,</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*md</span><span class="operator">);</span>
 
 <span class="keyword">int</span> <span class="variable">MD4_Init</span><span class="operator">(</span><span class="variable">MD4_CTX</span> <span class="variable">*c</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">MD4_Update</span><span class="operator">(</span><span class="variable">MD4_CTX</span> <span class="variable">*c</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">void</span> <span class="variable">*data</span><span class="operator">,</span> <span class="variable">unsigned</span> <span class="variable">long</span> <span class="variable">len</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">MD4_Final</span><span class="operator">(</span><span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*md</span><span class="operator">,</span> <span class="variable">MD4_CTX</span> <span class="variable">*c</span><span class="operator">);</span>
 
 
 <span class="comment">#include &lt;openssl/md5.h&gt;</span>
 
 <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*MD5</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*d</span><span class="operator">,</span> <span class="variable">unsigned</span> <span class="variable">long</span> <span class="variable">n</span><span class="operator">,</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*md</span><span class="operator">);</span>
 
 <span class="keyword">int</span> <span class="variable">MD5_Init</span><span class="operator">(</span><span class="variable">MD5_CTX</span> <span class="variable">*c</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">MD5_Update</span><span class="operator">(</span><span class="variable">MD5_CTX</span> <span class="variable">*c</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">void</span> <span class="variable">*data</span><span class="operator">,</span> <span class="variable">unsigned</span> <span class="variable">long</span> <span class="variable">len</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">MD5_Final</span><span class="operator">(</span><span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*md</span><span class="operator">,</span> <span class="variable">MD5_CTX</span> <span class="variable">*c</span><span class="operator">);</span>
</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit output.</p>

<p>MD2(), MD4(), and MD5() compute the MD2, MD4, and MD5 message digest of the <b>n</b> bytes at <b>d</b> and place it in <b>md</b> (which must have space for MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16 bytes of output). If <b>md</b> is NULL, the digest is placed in a static array.</p>

<p>The following functions may be used if the message is not completely stored in memory:</p>

<p>MD2_Init() initializes a <b>MD2_CTX</b> structure.</p>

<p>MD2_Update() can be called repeatedly with chunks of the message to be hashed (<b>len</b> bytes at <b>data</b>).</p>

<p>MD2_Final() places the message digest in <b>md</b>, which must have space for MD2_DIGEST_LENGTH == 16 bytes of output, and erases the <b>MD2_CTX</b>.</p>

<p>MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() are analogous using an <b>MD4_CTX</b> and <b>MD5_CTX</b> structure.</p>

<p>Applications should use the higher level functions <a href="../man3/EVP_DigestInit.html">EVP_DigestInit(3)</a> etc. instead of calling the hash functions directly.</p>

<h1 id="NOTE">NOTE</h1>

<p>MD2, MD4, and MD5 are recommended only for compatibility with existing applications. In new applications, SHA-1 or RIPEMD-160 should be preferred.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>MD2(), MD4(), and MD5() return pointers to the hash value.</p>

<p>MD2_Init(), MD2_Update(), MD2_Final(), MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() return 1 for success, 0 otherwise.</p>

<h1 id="CONFORMING-TO">CONFORMING TO</h1>

<p>RFC 1319, RFC 1320, RFC 1321</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man3/EVP_DigestInit.html">EVP_DigestInit(3)</a></p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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